Lesson T4.3.1
T4.3.1 What catalysts do Quiz: KS3 Chemistry, Unit 4
20 questions
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Lesson T4.3.1, What catalysts do: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 4: Chemical reactions, written with Revision Ninja.
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The 20 questions
-
What is the function of a catalyst in a reaction?
- Provides extra mass
- Slows down reaction
- Is used up
- Speeds up reaction
-
What happens to a catalyst by the end of a chemical reaction?
- Melts completely
- Turns into product
- Is destroyed
- Remains unchanged
-
How does a catalyst increase the rate of a chemical reaction?
- Increases temperature
- Lowers activation energy
- Adds more reactants
- Increases pressure
-
What is the effect of a catalyst on the total yield of product?
- Decreases yield
- Increases yield
- No change
- Doubles yield
-
Why are industrial catalysts economically important?
- Save energy and time
- Raise reaction temperature
- Consume extra fuel
- Increase waste products
-
Which metal is used as a catalyst in a car's catalytic converter?
- Calcium chloride
- Sodium
- Carbon dioxide
- Platinum
-
Which substance is a common catalyst for breaking down hydrogen peroxide into water and oxygen?
- Manganese(IV) oxide
- Calcium carbonate
- Sodium chloride
- Magnesium ribbon
-
Why is a catalyst omitted from overall chemical equations?
- Regenerated unchanged
- Forms a solid
- Turns into gas
- Dissolves fully
-
Which factor besides a catalyst increases reaction rate?
- Lower pressure
- Smaller surface area
- Lower concentration
- Higher temperature
-
What role does manganese dioxide play when added to hydrogen peroxide?
- Catalyst
- Product
- Reactant
- Inhibitor
-
What term describes biological catalysts that speed up reactions in living things?
- Hormones
- Enzymes
- Proteins
- Vitamins
-
What is the mass of a catalyst after a reaction finishes?
- Increased
- Unchanged
- Zero
- Decreased
-
What does a catalyst affect when halved reaction time yields equal product?
- Reactant volume
- Reaction rate
- Reaction temperature
- Product mass
-
Why can a chemical catalyst be reused many times in a reaction?
- Creates energy
- Melts away
- Not used up
- Absorbs heat
-
What is the key difference between a catalyst and a reactant?
- Catalysts form products
- Catalysts are consumed
- Reactants are used up
- Reactants speed reactions
-
How does a catalyst speed up a chemical reaction?
- Increases reactant mass
- Removes product molecules
- Lowers activation energy
- Raises reaction temperature
-
What happens to the total mass when a catalyst is added to a closed flask?
- Doubles instantly
- Decreases slowly
- Increases slightly
- Stays the same
-
What can impurities do to a catalyst during a reaction?
- Stop it working
- Increase its mass
- Turn it into a liquid
- Double its speed
-
Which statement is NOT a property of a catalyst?
- It is used up
- It is not consumed
- It remains unchanged
- It speeds reactions
-
What can extreme temperatures do to a catalyst's effectiveness?
- Make it permanent
- Create new elements
- Always improve speed
- Damage the catalyst
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